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Research on a prediction method of wind environment for a region consisting coastal area and off-shore structures

海岸带和近海建筑物区域风环境预测方法研究

基本信息

批准号：
09450378
负责人：
OHYA Yuji
金额：
$ 4.48万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

The objectives of the present research are to develop a numerical and experimental method to predict the wind environment for a region consisting of off shore and near sea in a complicated terrain. For the numerical method, we have focused on the development of grid generation method for computing terrain a method for computing high Reynolds number flows, such as LES, and a technique for boundary conditions for the inlet and ground. As the results, we have successfully developed a method for grid generation, by using a rectangular grid approximation technique, which enable us to generate a computational grid easily and effectively. This method will be very useful in a new feature, because the computer ability will develop year by year. A LES method has been employed to simulate high Reynolds number flows. Among turbulence models, LES is a most hopeful method for the simulation turbulence field. For the boundary conditions, to give a suitable turbulent conditions at the entrance of the computer domain, we have adopted a pre-domain method to compute the turbulent inflows. For the wind tunnel experiment, mean-velocity measurement and flow visualization experiment of the flow over a complex terrain was carried out to compare the results with those in numerical analyses. Both results show almost good agreement except for the region near ground.To sum up, although there still remain a couple of problems both in numerical and experimental method for the prediction of wind environment near coastal area, a system consisting of the numerical analysis and wind tunnel experiment has been successfully developed.

本研究的目的是发展一种数值和实验相结合的方法来预测复杂地形下由海岸和近海组成的区域的风环境。在数值方法方面，我们着重研究了计算地形的网格生成方法、计算高雷诺数流动的方法（如大涡模拟）以及处理入口和地面边界条件的技术。作为结果，我们已经成功地开发了一种网格生成方法，通过使用矩形网格近似技术，这使我们能够生成一个计算网格容易和有效的。这种方法将是非常有用的一个新的功能，因为计算机的能力将逐年发展。本文采用大涡模拟方法对高雷诺数流动进行了数值模拟。在湍流模型中，大涡模拟是最有希望模拟湍流场的方法。在边界条件方面，为了在计算域的入口处给出合适的湍流条件，采用了一种预域方法来计算湍流入流。在风洞实验中，对复杂地形的绕流进行了平均速度测量和流动显示实验，并与数值分析结果进行了比较。除近地面区域外，两者的结果基本一致。综上所述，尽管在近海风环境预报的数值分析和实验方法上还存在一些问题，但我们已经成功地建立了一个由数值分析和风洞实验相结合的系统。